WT thinking is very inbred. Promotion is based on thinking "inside the box". And at headquarters, WT articles are based on reworked previous WT articles or on talks written by Teaching. But Teaching bases many of those talks on quotes from previous WT publications and previous talk outlines. Comments are to be taken just from the study article under consideration... not with any quotes from "outside sources" because that's wasting precious time.
So what happens? You get extremism where the writer, or more often the local elders or CO, go beyond what was previously written to make a fence to protect the previous boundary. Then another guy adds another fence to protect the fence that's protecting the boundary. So you wind up with a bunch of rules to make a wedding more "spiritual"... and boring.
What else happens? You have these kids at a "spiritual gathering" where they drink Kool Aid and play Bible games. But then they sneak away and lead "double lives" because the JW life is horrible. And you also have these pioneers that have the appropriately boring weddings... and have an 8 lb. "premature" baby shortly after they get married.